全文获取类型
收费全文 | 55378篇 |
免费 | 2760篇 |
国内免费 | 197篇 |
专业分类
电工技术 | 877篇 |
综合类 | 93篇 |
化学工业 | 9842篇 |
金属工艺 | 2071篇 |
机械仪表 | 3076篇 |
建筑科学 | 1238篇 |
矿业工程 | 52篇 |
能源动力 | 2164篇 |
轻工业 | 4052篇 |
水利工程 | 251篇 |
石油天然气 | 207篇 |
武器工业 | 1篇 |
无线电 | 9998篇 |
一般工业技术 | 11164篇 |
冶金工业 | 5826篇 |
原子能技术 | 637篇 |
自动化技术 | 6786篇 |
出版年
2023年 | 506篇 |
2022年 | 306篇 |
2021年 | 1275篇 |
2020年 | 994篇 |
2019年 | 1012篇 |
2018年 | 1339篇 |
2017年 | 1330篇 |
2016年 | 1661篇 |
2015年 | 1311篇 |
2014年 | 2045篇 |
2013年 | 3510篇 |
2012年 | 3218篇 |
2011年 | 3938篇 |
2010年 | 2988篇 |
2009年 | 3186篇 |
2008年 | 2941篇 |
2007年 | 2470篇 |
2006年 | 2253篇 |
2005年 | 1946篇 |
2004年 | 1844篇 |
2003年 | 1687篇 |
2002年 | 1617篇 |
2001年 | 1217篇 |
2000年 | 1105篇 |
1999年 | 1079篇 |
1998年 | 2098篇 |
1997年 | 1360篇 |
1996年 | 1129篇 |
1995年 | 952篇 |
1994年 | 718篇 |
1993年 | 678篇 |
1992年 | 484篇 |
1991年 | 490篇 |
1990年 | 415篇 |
1989年 | 399篇 |
1988年 | 316篇 |
1987年 | 273篇 |
1986年 | 252篇 |
1985年 | 229篇 |
1984年 | 199篇 |
1983年 | 152篇 |
1982年 | 150篇 |
1981年 | 129篇 |
1980年 | 127篇 |
1979年 | 102篇 |
1978年 | 94篇 |
1977年 | 123篇 |
1976年 | 158篇 |
1975年 | 78篇 |
1974年 | 74篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
Sudong Chae Seungbae Oh Kyung Hwan Choi Jin Woong Lee Jiho Jeon Zhixiang Liu Cong Wang Chaeheon Woo Liyi Shi Joohoon Kang Si Young Song Sung Jae Kim Jung Heon Lee Hak Ki Yu Jae-Young Choi 《Ceramics International》2021,47(9):11935-11941
To achieve the stable dispersion of 1D van der Waals crystal Mo6S3I6 in aqueous media, the tri-block copolymer (Poloxamer) is used as dispersant. The head group of Poloxamer, hydrophobic polypropylene oxide parts can be adsorbed to Mo6S3I6 surface by hydrophobic interaction and the tail group with hydrophilic polyethylene oxide exposed to the outside of the Mo6S3I6 is soluble in water and can form sufficient steric hindrance, resulting in stable aqueous dispersion in nm scale. The excellent biocompatibility of aqueous dispersed nm scale 1D Mo6S3I6 was demonstrated by effective proliferation of C2C12 cells. 相似文献
72.
Minsu Kang Jooyong Lee Sangyoon Ko Dr. Sang-Hee Shim 《Chembiochem : a European journal of chemical biology》2021,22(8):1396-1399
Expansion microscopy combined with single-molecule localization microscopy (ExSMLM) has a potential for approaching molecular resolution. However, ExSMLM faces multiple challenges such as loss of fluorophores and proteins during polymerization, digestion or denaturation, and an increase in linkage error arising from the distance between the fluorophore and the target molecule. Here, we introduce a trifunctional streptavidin to link the target, fluorophore and gel matrix via a biotinylizable peptide tag. The resultant ExSMLM images of vimentin filaments demonstrated high labeling efficiency and a minimal linkage error of ∼5 nm. Our ExSMLM provides a simple and practical means for fluorescence imaging with molecular resolution. 相似文献
73.
Shin Hansub Sim Sungyong Kwon Hyukyoon Hwang Sangheum Lee Younho 《International Journal of Information Security》2022,21(1):25-36
International Journal of Information Security - This paper deals with a well-known problem in the area of the smudge attacks: when a user draws a pattern to unlock the pattern lock on a smartphone... 相似文献
74.
Choi HyungSeok Kim ChanHyung Choi Hyuk Lee JaeHwan 《Food science and biotechnology》2021,30(11):1435-1443
Food Science and Biotechnology - Buah merah oil and red palm oil are red colored and unrefined edible oils. Because of this color characteristic, measuring acid value by titration method can be... 相似文献
75.
Lee Wang-Hee Oh Il-Nam Choi Seunghyun Park Jong-Tae 《Food science and biotechnology》2021,30(10):1313-1319
Food Science and Biotechnology - Food authenticity is one of the largest concerns in recent days. As kimchi has been a global food, its production origin has been important issue, particularly due... 相似文献
76.
Food Science and Biotechnology - Recent studies have shown that γ-glutamyl peptides (GGPs) are recognized by the calcium-sensing receptor and induce kokumi taste. The contents of GGP have been... 相似文献
77.
78.
Deok-Hye Park Yo-Seob Kim Sang-Beom Han Woo-Jun Lee Hak-Joo Lee Yong-Soo Lee Sang-Hyun Moon Kyung-Won Park 《International Journal of Hydrogen Energy》2021,46(43):22499-22507
Electrochemical reactions such as the oxygen evolution reaction (OER), oxygen reduction reaction (ORR), and methanol oxidation reaction (MOR) are essential for energy conversion applications such as water electrolysis and fuel cells. Furthermore, Pt or Ir-related materials have been extensively utilized as electrocatalysts for the OER, ORR, and MOR. To reduce the utilization of precious metals, innovative catalyst structures should be proposed. Herein, we report a bi-metallic phosphide (Ni2P and PdP2) structure surrounded by graphitic carbon (Ni–Pd–P/C) with an enhanced electrochemical activity as compared to conventional electrocatalysts. Despite the low Pd content of 3 at%, Ni–Pd–P/C exhibits a low overpotential of 330 mV at 10 mA cm?2 in the OER, high specific activity (2.82 mA cm?2 at 0.8 V) for the ORR, and a high current density of 1.101 A mg?1 for the MOR. The superior electrochemical performance of Ni–Pd–P/C may be attributed to the synergistic effect of the bi-metallic phosphide structure and core-shell structure formed by graphitic carbon. 相似文献
79.
Food Science and Biotechnology - Coronavirus disease 2019 (COVID-19), caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), is mainly transmitted through respiratory droplets.... 相似文献
80.